import pygame.font
from pygame.sprite import Group
from ship import Ship


class Scoreboard:
    """显示分数，其中分数值保存在stats里面，这里只是用来显示"""

    def __init__(self, ai_settings, screen, stats):
        """ai_settings里面保存参数信息，screen用于绘制，仿照button类来写"""
        self.ai_settings = ai_settings
        self.screen = screen
        self.screen_rect = screen.get_rect()
        self.stats = stats
        # 字体颜色和大小
        self.text_color = (30, 30, 30)
        self.font = pygame.font.SysFont(None, 48)
        # 准备几艘飞船图像
        self.ships = Group()
        self.prep_images()

    def prep_images(self):
        # 准备初始得分图像
        self.prep_score()
        # 准备最高得分的图像
        self.prep_high_score()
        # 准备level的图像
        self.prep_level()
        self.prep_ships()

    def prep_score(self):
        """将score渲染为图像"""
        # round是四舍五入，在加一个-1，则是只保留10位数字
        rounded_score = int(round(self.stats.score, -1))
        # 格式化数字
        score_str = "{:,}".format(rounded_score)

        self.score_image = self.font.render(score_str, True, self.text_color, self.ai_settings.bg_color)
        self.score_rect = self.score_image.get_rect()
        # 得分放置的位置
        self.score_rect.right = self.screen_rect.right - 20
        self.score_rect.top = 20

    def draw_score(self):
        """在屏幕上显示得分"""
        self.screen.blit(self.score_image, self.score_rect)
        self.screen.blit(self.high_score_image, self.high_score_rect)
        self.screen.blit(self.level_image, self.level_rect)
        # 在左边绘制ships
        self.ships.draw(self.screen)

    def prep_high_score(self):
        """将high_score渲染为图像"""
        high_score = int(round(self.stats.high_score, -1))
        high_score_str = "{:,}".format(high_score)
        self.high_score_image = self.font.render(high_score_str, True, self.text_color, self.ai_settings.bg_color)
        self.high_score_rect = self.high_score_image.get_rect()
        # 得分放置的位置---水平居中，顶部20
        self.high_score_rect.centerx = self.screen_rect.centerx
        self.high_score_rect.top = 20

    def prep_level(self):
        """将level渲染为图像"""
        level = str(self.stats.level)
        self.level_image = self.font.render(level, True, self.text_color, self.ai_settings.bg_color)
        self.level_rect = self.level_image.get_rect()
        # 得分放置的位置---水平居中，顶部20
        self.level_rect.right = self.screen_rect.right - 20
        self.level_rect.top = self.score_rect.bottom + 10

    def prep_ships(self):
        """先创建一个组"""
        self.ships.empty()
        for ship_number in range(self.stats.ships_left):
            ship = Ship(self.ai_settings, self.screen)
            ship.rect.x = 10 + ship_number * ship.rect.width
            ship.rect.y = 10
            self.ships.add(ship)
